/*
 * Copyright (C) 2012 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.stats;

/**
 * Like an EventCounter but with additional functionality and
 * additional overhead.
 */
public interface GaugeCounter extends EventCounterIf<GaugeCounter> {
  /**
   * Number of times add(long delta) has be called.
   */
  public long getSamples();

  /**
   * Average value of delta for calls to add(long delta).
   */
  public long getAverage();

  /**
   * Like add(delta) but used for merging with other GaugeCounters.
   */
  public void add(long delta, long nsamples);
}
